Yamaha KMA-1080, Service Manual, Page: 35 / 51

A B C D E F G H
1
2
3
4
5
6
I J K L M N
7
8
9
10
35
KMA-1080/KMA-980
* All voltages are measured with a 10M
Ω
/V DC electronic volt meter.
* Components having special characteristics are marked
Z
and must be replaced
with parts having specifications equal to those originally installed.
* Schematic diagram is subject to change without notice.
OPERATION 2/2
MIC IN
0
0
0
0
0
0
0
0.6
0
0
2.1
0
0 0
2.1
2.1
1.9
5.1
1.6 1.6
1.9
0
1.6 1.6
1.9
5.1
5.1
0
~
0 0 0 0
5.1
5.1
0
0
5.1
~
5.1
0
0
2.8
2.8
2.8 2.7 2.8 2.8
0 0
0 0 0 5.1 5.1
1.6 1.6
1.9
0
0
0
5.1
5.1
0
0
0
~
2.1 2.1
~
5.1
2.1
2.1
2.1
2.1
2.1
0
0
0
0
0
0
12.1
-11.5
0
0
5.2
5.4
0
0
0
0
0
0
0.7
0
0
0
0
0
0.6
0
5.1
0
5.1
A
C77.8
A
C104.7
0
5.2
W201
CB238
CB237
CB562
W701
CB901
IC236
IC235
IC238
IC239
IC237
IC237
IC237 IC237
IC237 IC237
IC241
IC241
IC240
VIDEO SELECTOR
VIDEO AMP
VIDEO CONTROL
MIC AMP
W702
ECHO MODE
OPERATION (4)
OPERATION (1)
OPERATION (5)
OPERATION (7)
Page 33 A3
to FUNCTION (2)_W303
Page 34 G4
to OPERATION (2)_CB707
Page 36 K4
to MAIN (1)_CB409
Page 32 L7
to FUNCTION (1)_CB21
Page 36 K5
to MAIN (1)_CB411
to POWER TRANSFORMER
5 1
2
6 11 10
3 4 9 8 13 12
VIDEO
DVD INPUT
OUTPUT 1
OUTPUT 2
OUTPUT 3
AUX INPUT
BGM INPUT
MIC 1
MIC 2
MIC 3
BALANCED MIC INPUT
1
2
IMPEDANCE SELECTOR
REMOTE
POWER
ON/OFF
ECHO MODE
OPERATION (6)
VIDEO
DVD INPUT
OUTPUT 1
OUTPUT 2
BGM INPUT
Page 34 G4
to OPERATION (2)_CB707
KMA-1080 only
KMA-980 only
KMA-1080 only
KMA-1080 only KMA-980 only
KMA-1080 only
IC237: TC74HCU04AFEL
Hex inverters
VCC
6A
5A
4A
6Y
5Y
4Y
GND
3Y
3A
2A
1A
2Y
1Y
1
2
3
4
5
6
7
14
13
12
11
10
9
8
7 1 2 3 4 5 6
8 14 13 12 11 10 9
LOGIC
IN1
GND
CTLA CTLB
CTLC
IN2
GND
V
OUT
GND IN5 VCC IN4 GND IN3
IC235, 236 : BA7649AF-E2
Video signal switcher for VTR, TV
6 dB
Amp 75-ohms
Driver
CLAMP
2.0k
2.2k
750
5
6
8
6 dB
Amp 75-ohms
Driver
CLAMP
2.0k
2.2k
750
4
3
1
7
2
VIN2
VOUT2
V+
GND
VSAG2
VOUT1
VSAG1
VIN1
IC238, 239 : NJM2267M
Dual video 6 dB amplifier with 75-ohms driver
IC241:
UPC4570G2-E1-A
Dual operational amplifier
+ – + –
1
2
3
4
8
7
6
5
OUT
1
OUT
2
–IN
1
+IN
1
+IN
2
-IN
2
–V
CC
+V
CC
QH’ 9
10
SCLR
15
QA
14 SER
R
D Q
SCK
11 SCK
R
D Q
SCK
R
D Q
SCK
R
D Q
SCK
R
D Q
SCK
R
D Q
SCK
R
D Q
SCK
R
D Q
SCK
D Q
RCK
12 RCK
13
G
16
VCC
8
GND
1
QB
2
QC
3
QD
4
QE
5
QF
6
QG
7
QH
D Q
RCK
D Q
RCK
D Q
RCK
D Q
RCK
D Q
RCK
D Q
RCK
D Q
RCK
RCK
X
X
X
x
SCK
X
X
x
X
SCLR
X
L
H
H
G
1
X
X
X
FUNCTION
QA thru QH = Tri-State
Shift Register cleared
QH’ = 0
Shift Register clocked
QN = Qn-1, Q0 = SER
Contents of Shift
Register transferred
to output latches
IC240: TC74HC595AF
8-bit Shift register/latch (3-state)
●
EXTERNAL (REMOTE IN) CODE
Command name Code 1 Code 2
MUSIC up 7B-84 87-82
MUSIC down 7B-85 87-83
MIC up 7B-86 87-84
MIC down 7B-87 87-85
ECHO up 7B-88 87-86
ECHO down 7B-89 87-87
INPUT 7B-8C -
DVD 7B-8E -
TAPE 7B-8F -
BGM 7B-90 -
AUX 7B-91 -
ECHO MODE 7B-92 -
KEY CONTROL up 7B-96 -
KEY CONTROL
#
5 - 87-9D
KEY CONTROL
#
4 - 87-88
KEY CONTROL
#
3 - 87-89
KEY CONTROL
#
2 - 87-8A
KEY CONTROL
#
1 - 87-8B
KEY CONTROL 7B-97 87-8C
KEY CONTROL
b
1 - 87-8D
KEY CONTROL
b
2 - 87-8E
KEY CONTROL
b
3 - 87-8F
KEY CONTROL
b
4 - 87-90
KEY CONTROL
b
5 - 87-9E
KEY CONTROL down 7B-98 87-92
ECHO 1 7B-C2
ECHO 2 7B-C3
ECHO 3 7B-C4
PRESET 1 7B-DD
PRESET 2 7B-DE
PRESET 3 7B-DF